The browser should ask you to open "EE2 1.5 Launcher". When you accept it will generate a list of files in your folder (and their checksums). After that I can verify what's wrong with your installation.

When a report link opens, please paste it to this topic.

Best regards,Dr.MonaLisaMinistry of Game Affairs
Department of Control and Complains

You game installation is damaged. A lot of .zip archives from the zips folder were unpacked and they're conflicting with each other.

The only solution would be:
1. Uninstalling EE2 and manually deleting the folder with all files which are remaining.
2. Installing EE2 again (best if selecting a new folder).
3. Installing Unofficial Patch 1.5.

After that your game should work fine. To confirm that, you can click the link I posted again and paste report here.

Best regards,Dr.MonaLisaMinistry of Game Affairs
Department of Control and Complains